versioning: Unify all versioning to match skiboot versions

Previously there has been some uncertainty as to how separate binaries were
to be versioned compared to the firmware version as they could change (or
not change) out of sync with skiboot versioning. Historically pflash was
born with its own version which didn't help the issue.

It has been decided that make_version.sh should always return one version
which is shall be the skiboot firmware version, external binaries can
supply their own prefix which will be s/skiboot/$prefix/ but the default
behaviour is the git tag versioning.

The main reason for versioning here is so developers can identify which
version of the code someone is running, versions which closly match the
source tree are easiest to deal with. The idea with one version and
every binary getting a bump regardless of changes is that there is a lot of
shared code (libflash/libffs are a prime example) and even if an external
binary isn't explicitly updated it is possible that changes to shared code
may be missed.

This patch simplifies make_version.sh which had been updated to deal with
pflash- git tags.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

Makefile.main

@@ -156,7 +156,7 @@ $(SUBDIRS):
 # Set V=1 if you want to see everything.
 include $(SRC)/Makefile.rules
 
-VERSION ?= $(shell cd $(SRC); GIT_DIR=$(SRC)/.git $(SRC)/make_version.sh skiboot)
+VERSION ?= $(shell cd $(SRC); GIT_DIR=$(SRC)/.git $(SRC)/make_version.sh)
 
 .PHONY: VERSION-always
 .version: VERSION-always

external/pflash/rules.mk

@@ -25,7 +25,7 @@ PFLASH_VERSION ?= $(shell ./make_version.sh $(EXE))
 
 version.c: make_version.sh .version
 	@(if [ "a$(PFLASH_VERSION)" = "a" ]; then \
-	echo "#error You need to set SKIBOOT_VERSION environment variable" > $@ ;\
+	echo "#error You need to set PFLASH_VERSION environment variable" > $@ ;\
 	else \
 	echo "const char version[] = \"$(PFLASH_VERSION)\";" ;\
 	fi) > $@

make_version.sh

@@ -1,35 +1,23 @@
 #!/bin/bash
 
 usage() {
-	echo "$0 git-tag-prefix"
-	echo -e "\tIf inside git dir specify a tag prefix to use."
-	echo -e "\tWhere a prefix is anything before the first dash '-' character."
+	echo "$0 [ prefix ]"
+	echo -e "\t Optionally specify a prefix other than 'skiboot'"
 	echo
-	if test -d .git || git rev-parse --is-inside-work-tree > /dev/null 2>&1;
-	then
-		echo "Possible tags include:"
-		git tag | cut -d '-' -f 1 | sort | uniq
-	fi
 }
 
-if test -e .git || git rev-parse --is-inside-work-tree > /dev/null 2>&1;
+if [ "$1" = "-h" -o "$1" = "--help" ] ;
 then
-	if [ $# -ne "1" ] ; then
-		usage
-		exit 1;
-	fi
-
-	TAG_PREFIX="$1"
-
-	#Check that there is at least one of such a prefix
-	if ! git tag | grep -q "$TAG_PREFIX" ; then
-		echo -e "There isn't a single gix tag with prefix '$TAG_PREFIX'\n" > stderr
-	fi
+	usage
+	exit 1;
+fi
 
-	version=`git describe --exact-match --match "$TAG_PREFIX-*" 2>/dev/null`
+if test -e .git || git rev-parse --is-inside-work-tree > /dev/null 2>&1;
+then
+	version=`git describe --exact-match 2>/dev/null`
 	if [ -z "$version" ];
 	then
-		version=`git describe --match "$TAG_PREFIX-*" 2>/dev/null`
+		version=`git describe 2>/dev/null`
 	fi
 	if [ -z "$version" ];
 	then
@@ -51,6 +39,11 @@ then
 		version="$version-$diffsha"
 	fi
 
+	if [ $# -eq 1 ];
+	then
+		version=`echo $version | sed s/skiboot/$1/`
+	fi
+
 	echo $version
 else
 	if [ ! -z "$SKIBOOT_VERSION" ];